Incandescent electric lamp.



N0. 806,723. V PATENTED DEC. 5, 1905. J. G. WORMLEY.

INGANDESOENT ELECTRIC LAMP.

APPLICATION FILED anus. 1904.

W 6171135565: fill 631117012 UNITED STATES JAMES C. WORMLEY, OF NEWYORK, N. Y.

INCANDESCENT ELECTRIC LAMP- Specification of Letters Patent.

Patented. Dec. 5, 1905.

Application filed January 15, 1904:- Serial N0- 189.222-

T0 all whom it may concern: I

Be it known that I, JAMES C. WORMLEY, a citizen of the United States,residing at New York city, in the county of New York and State of NewYork, have invented certain new and useful Improvements in IncandescentElectric Lamps, of which the following is a specification.

My invention relates particularly to the method of forming or loopingthe filaments of the lamp for the purpose of securing a moreadvantageous distribution of the light than is obtained by lampsheretofore made.

It is a well-known fact that most forms of incandescent lamps give thegreatest intensity of illumination on the horizontalthat is, in adirection perpendicular to the axis of the lamp. Now as lamps arecommonly used when suspended in line with the axis of the lamp itfollows that the major part of the illumination is thrown out sidewisefrom the lamp instead of beneath, where the illumination is generallyrequired to be thestrongest. This results from the fact that thefilaments are placed in the lamps with the major axes of their loops ina vertical direction, thereby presenting a greater extent of luminoussurface when viewed from the horizontal than when viewed from thevertical or tip end of the lamp.

My filament is so shaped as to present a greater amount of luminoussurface when viewed through the lower or tip end of the lamp. The formof my filament when viewed from this position is shown in Fig. 1. Thefilament is formed into convolutions of a gridiron form, the number ofconvolutions being varied according to the voltage at which the lamp isto be run. The part of the filament so formed is supported by extendingtwo portions in a direction at right angles to the plane of theconvolutions, the said portions or legs being attached to the leading-inwires attach ed to the lamp. A perspective view of my filament is shownin Fig. 2, in which L and L are the legs and H I J K L M N O are thesegments of the convolutions. A lamp constructed with a filament formedin this manner will give sixteen candle power intensity through thebottom or tip end of the lamp, with a mean horizontal intensity ofthirteencandle power and a similar distribution when made for othercandle-powers, thus giving the greatest intensity of illuminationbeneath the lamp when installed in the most common position.

Having thus fully described my invention, what I claim is 1. In anincandescent lamp, a filament having a series of convolutions consistingof substantially parallel bars connected by curves lying substantiallyin the plane of the straight bars, the ends of the filament convergingand being connected to and integral with the convolutions.

2. In an incandescent lamp, metallic wires leading into the lamp, afilament having a series of convolutions consisting of substantiallyparallel bars connected by curves, the parallel bars lying in a surfaceof revolution whose curvature is substantially concentric with thecurvature of the bulb, the ends of the filament being integral with theconvolutions, and substantially normal to the surface in whichsaidconvolutions lie, the said ends converging and attached to the ends ofthe metallic wires.

3. In an incandescent lamp, metallic wires leading into the lamp, afilament having aseries of convolutions consisting of substantiallyparallel bars connected by curves, the parallel bars lying substantiallyin a surface of revolution, the ends of the filament being integral withthe convolutions and substantially normal to the surface in which saidconvolutions lie, the said ends converging and attached to the ends ofthe metallic wires.

4. In an incandescent lamp, an integral filament having connection tothe light-wires, and having its body composed of substantially parallelbars connected by curved portions, the parallel bars lying in linesnearly transverse to the glass bulb, and about equally distant from thecurved lower end of the bulb.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES o. WoRMLEY.

. Witnesses:

E. L. ELLIOTT, F. B. KAVANAGH.

